1 is less than or equal to x and x is less than 8

Mathematics

2 answers:

RideAnS [48]3 years ago

8 0

Answer in the pictures

liq [111]3 years ago

3 0

If your answer is to put this into an equation, the answer is 1≤x<8

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4<br>-5a+b=8<br>7a +9b = -32<br>I need to use substitution for this one. Help?

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$\left\{\begin{array}{ccc}-5a+b=8&\text{add}\ 5a\ \text{to both sides}\\7a+9b=-32\end{array}\right\\\\\left\{\begin{array}{ccc}b=5a+8&(1)\\7a+9b=-32&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\7a+9(5a+8)=-32\qquad\text{use the distributive property}\\\\7a+(9)(5a)+(9)(8)=-32\\\\7a+45a+72=-32\qquad\text{subtract 72 from both sides}\\\\52a=-104\qquad\text{divide both sides by 52}\\\\\boxed{a=-2}\\\\\text{Put the value of}\ a\ \text{to (1):}\\\\b=5(-2)+8\\\\b=-10+8\\\\\boxed{b=-2}$

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